How to lay roads...

Hi, this probably sounds really stupid but I'm trying to build my own map and I can't figure out how to place a road. It must be really simple, but I can't figure it out.

I can load splines but how do I then place that on to the map? I tried clicking and dragging on to the map but that doesn't work. I tried double clicking, I tired right clicking... but nothing seems to happen. All I have is a blank map.

The same problem with objects - how do I put an object on to the map when I've selected which one I want?

the unbelievable magic of the button "N" will be with you! just select an object or spline by left clicking, move the mouse into the map, press N (for new), and the piece will "hanging on the cursor". you can pick up the objects again, if you click on them on the map and press G (for grab).